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On the housing where the thermostat bolts on, just above the water pump and below the upper rad line (the suppily), there is a temperature sensor. Remove it, install a Tee into the fitting and reinstall the temp sensor in one of the legs of the Tee, and the sensor from the after-market gauge in the other. run the sensor wire through the firewall and up to the gauge in the dash. Connect the lights to the gauge and there you go. On my 4cyl there was another temperature sensor at the back of the head (up close to the firewall) that went to the dash idiot light. I suppose you could pull it, and install the sensor there. But I kinda liked having the idiot light as a backup. The sensor in the front that you are teeing into is the one that measures engine temp for the computer, so make sure that you reinstall it.

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Q: How do you install an aftermarket temp gauge on a 1988 s10?
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